Understanding Investment Return on Investment (ROI)
Return on Investment (ROI) is a performance measure used to evaluate the efficiency of an investment or compare the efficiency of a number of different investments. ROI tries to directly measure the amount of return on a particular investment, in relation to the investment's cost. To calculate ROI, the benefit (or return) of an investment is divided by the cost of the investment.
The formula for basic ROI is:
ROI = ((Current Value of Investment – Cost of Investment) / Cost of Investment) * 100
This calculator helps you determine the simple ROI of your investment. It takes into account your initial investment amount and its current value. Additionally, it calculates the annualized ROI, which shows the average yearly return, making it easier to compare investments over different time frames.
Annualized ROI Formula:
Annualized ROI = ((1 + ROI / 100)^(1 / Time Period)) – 1) * 100
Example:
Let's say you invested $5,000 (Initial Investment) in a stock, and after 2 years (Time Period), its current value is $7,500 (Current Value).
- ROI Calculation: (($7,500 – $5,000) / $5,000) * 100 = ( $2,500 / $5,000 ) * 100 = 0.5 * 100 = 50%
- Annualized ROI Calculation: ((1 + 50% / 100)^(1 / 2) – 1) * 100 = ((1 + 0.5)^(0.5) – 1) * 100 = (1.5^0.5 – 1) * 100 = (1.2247 – 1) * 100 = 0.2247 * 100 = 22.47%
So, your investment has yielded a 50% ROI over 2 years, with an average annualized return of approximately 22.47%. This information is crucial for making informed investment decisions and understanding how your capital is growing.
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border-radius: 8px;
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function calculateROI() {
var initialInvestment = parseFloat(document.getElementById("initialInvestment").value);
var currentValue = parseFloat(document.getElementById("currentValue").value);
var timePeriod = parseFloat(document.getElementById("timePeriod").value);
var roiResultElement = document.getElementById("roi-result");
var annualizedRoiResultElement = document.getElementById("annualized-roi-result");
roiResultElement.textContent = "";
annualizedRoiResultElement.textContent = "";
if (isNaN(initialInvestment) || isNaN(currentValue) || isNaN(timePeriod) || initialInvestment <= 0 || timePeriod <= 0) {
roiResultElement.textContent = "Please enter valid positive numbers for all fields.";
return;
}
// Calculate ROI
var profit = currentValue – initialInvestment;
var roi = (profit / initialInvestment) * 100;
roiResultElement.innerHTML = "
Return on Investment (ROI): " + roi.toFixed(2) + "%";
// Calculate Annualized ROI
if (timePeriod > 0) {
var annualizedRoi = (Math.pow((currentValue / initialInvestment), (1 / timePeriod)) – 1) * 100;
annualizedRoiResultElement.innerHTML = "
Annualized ROI: " + annualizedRoi.toFixed(2) + "% per year";
} else {
annualizedRoiResultElement.innerHTML = "
Annualized ROI: Cannot calculate for a time period of 0.";
}
}